internal int GetDatePart(long ticks, int part)
{
PersianCalendar.CheckTicksRange(ticks);
long numberOfDays = ticks / 864000000000L + 1L;
int year = (int)Math.Floor((double)(CalendricalCalculationsHelper.PersianNewYearOnOrBefore(numberOfDays) - PersianCalendar.PersianEpoch) / 365.242189 + 0.5) + 1;
if (part == 0)
{
return(year);
}
int ordinalDay = (int)(numberOfDays - CalendricalCalculationsHelper.GetNumberOfDays(this.ToDateTime(year, 1, 1, 0, 0, 0, 0, 1)));
if (part == 1)
{
return(ordinalDay);
}
int month = PersianCalendar.MonthFromOrdinalDay(ordinalDay);
if (part == 2)
{
return(month);
}
int num = ordinalDay - PersianCalendar.DaysInPreviousMonths(month);
if (part == 3)
{
return(num);
}
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_DateTimeParsing"));
}
private long GetAbsoluteDatePersian(int year, int month, int day)
{
if (year < 1 || year > 9378 || (month < 1 || month > 12))
{
throw new ArgumentOutOfRangeException((string)null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
}
int num1 = PersianCalendar.DaysInPreviousMonths(month) + day - 1;
int num2 = (int)(365.242189 * (double)(year - 1));
return(CalendricalCalculationsHelper.PersianNewYearOnOrBefore(PersianCalendar.PersianEpoch + (long)num2 + 180L) + (long)num1);
}
